IBM 8671 Hardware Maintenance Manual - Page 17

server. The meaning of the attention LED is defined by your operating system. For an illustration showing this LED on the system board, see "LEDs for Active PCI slots" on page 36. NMI button: The Non-Maskable Interrupt (NMI) button is for service use only. DC power LED: This green LED provides status information about the power supply. During typical operation, both the ac and dc power LEDs are on. For any other combination of LEDs, see "Power-supply LED errors" on page 146. AC power LED: This green LED provides status information about the power supply. During typical operation, both the ac and dc power LEDs are on. For any other combination of LEDs, see "Power-supply LED errors" on page 146. Operator information panel The following illustration shows the status LEDs on the operator information panel on the front of the server. Power-on POST- Hard disk drive Information LED complete LED activity LED LED OK /TX 1 RX Ethernet transmit/ receive activity LED Systemerror LED Important: If the power-on LED is off, it does not mean there is no electrical current present in the server. The LED might be burned out. To remove all electrical current from the server, you must unplug the server power cords from the electrical outlets or from the uninterruptible power device. Power-on LED: When this green LED is on, power is present in the server. When this LED flashes, the server is in Standby mode (the system operating system is turned off and ac current is present). When this LED is off, the power subsystem, the ac power, or an LED has failed. POST-complete LED: This green LED is on when POST is completed without any errors. Hard disk drive activity LED: This green LED flickers when there is activity on a hard disk drive. Information LED: When this amber LED is on, the server power supplies are nonredundant, or some other noncritical event has occurred. The event is recorded in the Error log. See "Viewing error logs from the Configuration/Setup Utility program" on page 32 for instructions for viewing the Error log. Check the diagnostic LED panel for more detailed information (see "Diagnostic panel system error LED" on page 132. System-error LED: This amber LED is on when a system error occurs. An LED on the diagnostic LED panel will also be on to further isolate the error. (For more information, see "Diagnostic panel system error LED" on page 132.) Ethernet transmit/receive activity LED: When this green LED is on, there is activity between the server and the network. Chapter 1. General information 7